Purchase order & contains supplements

What causes this issue?

Purchase order &V1& is allocated to the invoice. This purchase order
contains supplements.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

If you want to display the purchase order supplements, you have to
branch to the purchase order.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.